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Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.004 Å; R factor = 0.056; wR factor = 0.147; data-to-parameter ratio = 15.8.In the title compoud, C 16 H 13 NO 5 S, the heterocyclic thiazine ring adopts a twist boat conformation with the S and N atoms displaced by 0.339 (5) and 0.322 (4) Å , respectively, on opposite sides of the mean plane formed by the remaining ring atoms. An intramolecular O-HÁ Á ÁO interaction is present, forming a five-membered ring. The crystal structure is stabilized by intermolecular N-HÁ Á ÁO hydrogen bonds, which result in chains along the b axis. Related literature

Authors' Contribution MS collected the data and did lab work. AZ conceived the idea and supervised the study. SK and MS wrote the manuscript. SK did analysis, took measurements and interviewed the participants. SB facilitated the study. RM and MI helped in analysis. SB, MI and RM did critical review.

In the title compound, C25H21NO7S, the heterocyclic thia­zine ring adopts a half-chair conformation, with the S and N atoms displaced by −0.284 (3) and 0.411 (3) Å, respectively, from the plane formed by the remaining ring atoms; the puckering parameters are: Q = 0.4576 (13) Å, θ = 58.6 (2) and ϕ = 34.3 (3)°. The structure is devoid of any classical hydrogen bonds. However, intra­molecular C—H⋯N and O—H⋯O hydrogen bonds result in six-membered rings and inter­molecular C—H⋯O inter­actions stabilize the crystal structure.

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